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Recent studies show that some vitamins and cancer-fighting properties in vegetables and fruit are fat-soluble, meaning the body requires fat to absorb the nutrients. Adding avocado or reduced-fat dressing to a salad instead of fat-free can increase levels of carotenoids, lycopene, beta carotene and other nutrients that appear to require the presence of a little fat to be fully absorbed, according to several studies.

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A study found those who consumed full-fat salad dressing were better able to absorb carotenoids, which have been linked to heart disease and cancer prevention. Lycopene, carotene and beta-carotene all showed markedly increased absorption when consumed in full-fat dressings.

A study found those who consumed full-fat salad dressing were better able to absorb carotenoids, which have been linked to heart disease and cancer prevention. Lycopene, carotene and beta-carotene all showed markedly increased absorption when consumed in full-fat dressings.